<template>
	<view>
		<view class="search-box">
		  <!-- 使用 uni-ui 提供的搜索组件 -->
		  <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
		</view>
		
		
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !== 0">
		  <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
		    <view class="goods-name">{{item.goods_name}}</view>
		    <uni-icons type="arrowright" size="16"></uni-icons>
		  </view>
		</view>
		
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
		  <!-- 标题区域 -->
		  <view class="history-title">
		    <text>搜索历史</text>
		    <uni-icons @click="clearHistory" type="trash" size="17"></uni-icons>
		  </view>
		  <!-- 列表区域 -->
		  <view class="history-list">
		    <uni-tag @click="gotoGoodsList(item)" :text="item" v-for="(item, i) in historys" :key="i"></uni-tag>
		  </view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
				kw: '',
				searchResults: [],
				historyList: []
			};
		},
		computed: {
			historys() {
				return [...this.historyList].reverse()
			}
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods: {
		  clearHistory() {
			  this.historyList = []
			  uni.setStorageSync('kw', '[]')
		  },
		  input(e) {
			  clearTimeout(this.timer)
			  this.timer = setTimeout(() => {
				  this.kw = e
				  this.getSearchList()
			  }, 500)
		  },
		  async getSearchList() {
				if (this.kw === '') {
					this.searchResults = []
					return
				}
				const { data: res } = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw })
			    if (res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				if (this.searchResults.length !== 0)
				this.saveSearchHistory()
		  },
		  gotoDetail(goodsId) {
			  uni.navigateTo({
			  	url: '/subpkg/goods_detail/goods_detail?goods_id=' + goodsId
			  })
		  },
		  gotoGoodsList(item) {
			  uni.navigateTo({
			  	url: '/subpkg/goods_list/goods_list?query=' + item
			  })
		  },
		  saveSearchHistory() {
		      // 2.1 直接把搜索关键词 push 到 historyList 数组中
		      // 1. 将 Array 数组转化为 Set 对象
		        const set = new Set(this.historyList)
		        // 2. 调用 Set 对象的 delete 方法，移除对应的元素
		        set.delete(this.kw)
		        // 3. 调用 Set 对象的 add 方法，向 Set 中添加元素
		        set.add(this.kw)
		        // 4. 将 Set 对象转化为 Array 数组
		        this.historyList = Array.from(set)
				uni.setStorageSync('kw', JSON.stringify(this.historyList))
		    }
		}
	}
</script>

<style lang="scss">
	.search-box {
	  position: sticky;
	  top: 0;
	  z-index: 999;
	}
	.sugg-list {
	  padding: 0 5px;
	
	  .sugg-item {
	    font-size: 12px;
	    padding: 13px 0;
	    border-bottom: 1px solid #efefef;
	    display: flex;
	    align-items: center;
	    justify-content: space-between;
	
	    .goods-name {
	      // 文字不允许换行（单行文本）
	      white-space: nowrap;
	      // 溢出部分隐藏
	      overflow: hidden;
	      // 文本溢出后，使用 ... 代替
	      text-overflow: ellipsis;
	      margin-right: 3px;
	    }
	  }
	}
	.history-box {
	  padding: 0 5px;
	
	  .history-title {
	    display: flex;
	    justify-content: space-between;
	    align-items: center;
	    height: 40px;
	    font-size: 13px;
	    border-bottom: 1px solid #efefef;
	  }
	
	  .history-list {
	    display: flex;
	    flex-wrap: wrap;
	
	    .uni-tag {
	      margin-top: 5px;
	      margin-right: 5px;
	    }
	  }
	}
	
</style>
